Electric light.



A.. 5w. GAST, ELECTRIC LIGHT. APPLlOTOE, .FILED MAB, 16, 1911.

1,43y2 Pamesa mm2, 1912.

a citizen of 'the United btates, residirig at forni a part of this specification.

'To all who/m, it may concern: f

Vincandescent filament 'heretofore used. a

.part inluded- Withinthe tube and tbe inethe invention g .DOLPH W. GAST, OF CHIG'O, ILLINGIS,

WORKS, 0F CHICAGO, ILLINOIS,

nnnlcffuic tiene?,

Speiee'tion of Letters-Patent.

*en i- Y il atenten Be it known that l, AnoLPH W. @aan Chicago, county of Cook, State of illinois, have invented :iJfcertain'new and useful lm pi'ovenient ilectiic Lights, and declare the following to bea full, clear, and exact description oi the same, such as will enable others skilled in the art to which it pertains to malto and usethe. saine, 'reference being had to the accompanying drawings, 'which This invention relates to electric lights.

It has foi' itsobject an eleotigic light made in a shape to be'used foi" advertising pun poses and constructedpto pi'qcluce a light tlnough the tube. Fig. fl, a longitudinal section thi'ougli the tubeanf the guard op plied thereto.

The main part of the character is formed as a glass tube constructed to irnn'esent any letter oi character that may Vbe desired, Through that Wall oi the tube, which for the purpose of eleainess may be oonsideifeiil the back Wall, conductor inen" are sealed into the glass in any suitable inann-; the filament :El ni'eit'eifebly what. known non' as the tungsten filament secured to the innei' ends oi' the eonductois l and 2 and the outer ends oi the conductors l and Q are secured, to the ends of pieces 4 and 5 of an ordinary coppei oit siniilai? methat is diffused to a greater extent tliioughout theexhausted tube than alight in which the incandescent member is large and con-i centrated in a single place or a single loop along the tube. In the lamp in which this invention is embodied, in place 'ofthe single large number of small filaments are inserted at intervals along the ,conduotoi' line' ldie main part or metallic part of `which' extends'` outsideof the tube with the incandescent tallio connectionbetweenA the incandescent A'part and the metallic conductor extending through the glassv andsealed into it; the metallic Ilaria oi" the-circuit extending' along the outside of the tube is coveied'by a cement ,compound andI a` metallic guard vcovers tlie cement compound and is held to the glass by the cement, thus securely protecting the more or' less friable ceinent i'iom accidental abrasion.

tallic WireA lll of the included filaments oi" which there inay be such number as may be desired. are in series on the saine oondoctor from 8 to 9, and the saine oonduetor` continued haelt to lll along the outer surface of the tube Y. That pai't ot the wire upon which the filaments are seA Cured and that part oi? the wie@ 'whieh may be considered the retin-n are then coveted in by cement compound ll' and tlieeinent compound itself is ooveied in by metalli(- backing or ooatinv" l2, which adheres to the cement compound and held by the cement compound to the glass. oft the tube. rlhe glass tube thus constructed is protected'by the metalli@ protecting piece 1L' which extends along `the entiievbaok of it, following" In the drawings are shown two letters which characterize.r the construction and which .may he used as indicating the ebarl acier o i" the invention which is applicablef to any and all letters or figures suitable to i .be used for advertising purposes. i

Figure l, shows the lettei; Tembodying l the ligure 1s not, strictlyi eithei-elevational or in plan 'but is rather y diagrammatic, to bring out the relation of l the electtical elements and the glass tube. l Fig. 2, similarly diaglainniatie, shows the l letter S and characterizes the invent-ion `When employed in "a letter or igui'e of owed ('utlii'iel 3 is a cross section I electric circuit, generally each light is oi. small intensity and the ent-ire colleetion of lights in the series no more than equal 'a single large light in their aggregate intensity, but being spiead at s liortiutei'vals along the length o the tube, they coi'itribute to form a light Whichat a, short dist-ance is so oommingled-'that the separate elements are not readilyv distinguishable.

Preferably the filament is so 4airai'igeol ith respect to the axis of the tube that the tuvo bra nelies thereof and the cross member' thereof are spaced along the a- `i of 'the tube and the reflective action of the tube in which the lainents are mounted serve to 1n- `:reuse the evenness in the degree of the light and render the distinctive character of the separate lights less apparent.

What I claim is 1. 'ln :in electric sign lamp, an exhausted y tube having a part of its axis offset from :L straight line, and means to illuininatethe' tube at spaced points along such' axis.

2. In an electric sign lamp, a plurality .of

filaments spaced independently upon a line conforming to a predetermined sign characd ter, an exhausted' tube embraeingilid fila,-

rnents and conforming to the she oberste-- ter, end ineens to supply'an electric culi-J. rent to said filaments to raise sald yfilalnlents to ncandescence. r

In testimony whereof, l sign this specification in the presence of two Witnesses. 

